Water-tight sink



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THOMAS J. MAYALL, OF ROXBURY, MASSACHUSETTS.

WATER- TIGHT SINK.

Specification of Letters Patent No. 24,221, dated May 31, 1859.

forth the nature and principles of my inn-- proveinents by which myinvention may be distinguished from all others of a similar class,together with such vparts as I claim and desire to have secured to me byLetters Patent.

The figures of the accompanying plate of drawings represent myimprovements.

Figure l is a plan or top view of a sink. Fig. 2, is acentrallongitudinal, vertical section of saine. Fig. 3 is a transversevertical section. Figs. 4f and 5 are sectional views showing' the sinkin its molds.

My invention consists of a new method of making water-tight sinks. Toaccomplish this result I have after various experiments found desirablecompositions of gutta percha and india rubber and other substances, anda method of forming them into sinks, which I will describe.

I make a composition in the following proportions; viz; one lialf poundof the rubber rags or clippings which are very well known among rubbermanufacturers, being the shreds of cloth coated with rubber, one halfpound of india-rubber or gutta-percha, six ounces of litharge, sixounces of sulfur, half an ounce of carbonate of magnesia and mix themthoroughly together. This composition is to form the body of the sink.To form the drainage pipe, I use a different composition which isdesigned to be highly elastic and is formed of any of the well knownelastic compositions of vulcanized india rubber.

The composition for the body of the sink is placed in an iron moldformed in two parts, the bottom being a cavity of the shape of theoutside of the sink, tub, or bowl and the top being in the form of a dieor follower, which presses the soft rubber or gutta percha into thecavity and at the same time impresses upon it the desired shape of theinside of the sink and the flange at the to In the lower part of themold a a there is a cavity b with a corresponding followero.

In this part of the mold a I place the elastic composition which isdesigned to form the elastic drain pipe Z of the sink e. Thewliole isthen heated in any suitable heater and at a temperature of 200O for fourhours.

In forming the drainage pipe I make it round at the top, where thediameter varies according to the size of the sink,--its,length varies asdesired, but the usual length is about four inches. In order to allowthe water to iiow through and at the same time to prevent largesubstances from being carried down, as wellvas to make a scent trap tostop the foul air from ascending from the drains, I make this drain pipein a form gradually changing from a circular hole at the top to a wedgeshape at the bottom, where the water is allowed to pass through a slitin the wedge. The elasticity of the rubber at the bottom of the pipekeeps the slit closed when water is not passing through.

The composition of gutta-percha or indiarubber and the degree of heat tobe used, admit of great variations, and I do not particularly limitmyself to any particular comfposition or degree of heat but havedescribed Vthe best.

rThe best consistency for the sink, is, of the hardness of hard soleleather', but harder or 'softer compositions can be used with good bedescribed.

In making the sink, the inside of it can be i made hard and the outsidesoft or the reverse if desired, either by modification of thecomposition or by applying different degrees of heat to the upper andlower sides of the mold, in modes well known among rubber manufacturers.When the sink is very thin, it can be stayed or strengthened by ribs ofrubber running across the lower side of the sink. The sink can be madeof any desired thickness, and the molds will regulate the thickness, butfor ordinary purposes, an eighth of an inch is sufficient on account ofthe remarkable strength and tenacity of vulcanized india-rubber andgutta-percha,c0m pounded as described. The sinks may be made of anydesired size or shape, and the drain pipes and outlets can be varied atwill. When a metallic outlet or drain of a hard rubber or other kind ofstrainer is desired, it can be placed in the mold and firmly fixed in`its place, intheprocess of vulcanization or it can be placed in thesink afterward. l

By the means above described, I amenabled to form sinks Without a jointor crack, which are not in danger of being broken and which do notabsorb the luids passing through and Whichprevent the dishes Which areused in them, from being broken.

Having thus fully described the nature of mi); said improvement and themanner in W ich the same is or may be carried into effeet, IV Wouldobserve that I do not intend in this application to claim the elasticdrainage pipeV terminating inA a Wedge Vshape-as 'this Willconst'itutethe subject `matter of a sepa* rate application for patent, but l/Vhat Ido claim as my invention and desire to secure by Letters Patent is- `Theproduction, as a new article of manufacture, of watertight sinks formedfrom vulcanized india rubber or gutta percha, substantially in themanner and for the purl `poses above set forth.

THO.V J. MAYALL.

Witnesses v JOSEPH GAVETT, ALBERT W. BROWN.

